Yarn tension for shuttles



Jan. 20, 1931. H. A. DAVOL YARN TENSION FOR SHUTTLES Filed Oct. 12, 1928 efs inga curved under surface which merges with the outer surface of the part 13 of the arm to provide a'thin lower edge for the latter. This lower edge of the arm 13 isspaced from the arm 12 so as to provide an openingleading in aforward direction from'the recess 14 into the threading slot 6; The recess 14 is'also 1 open at opposite sides of the block into the 1 ,horizontal thread passage above referred to.

The arms; 1 1 and'12 are provided with aligned'openingsi for the reception ofa screw j 15, the head portion of which .has' -screW- 1101 in :the'block 7 firmlyin position) L vvOn t e arm 12 I preferably mount a wearresistant tens-ion element'16 (Fig.6). fPreferalilythis tension element consists of a relat ively thin plate of sheet steel, heat treated to make it Wear resistant, and having a downizs turnedflange 17 atitsleft side (asviewed in Fig. 4,). said flange alsoextending along the front: edge of this tension element The flange is preferably sm'oothlyfrounded as shown at 18 (Fig; 5) toavoid wear or cutan oftheyarn andatthesame time to form all aring throat to assist in entrance of the arm-between itand the upper tensionelement.

"Oneof the two ele1nents,'for example the elememe-1c is preferably provided with spacer meansyfoi 'example two or more bosses 19, '(Fig. .6) adapted to engage theopposed plate and'at this point to hold the plates indefinite spaced. relation as hereafter described. The

l plate" 16 is provided with 'an o1'3ening 20 through which the screw 15 passes, and its rear edge is substantially" straight and adapt? 'edto engage the substantially flat-rear face i I of the recess '14.

consists o The upper tension element 21-preferably sheet steel having anopening for the passage flange is smoothly rounded as indicated at23,

; -(-Fig.3) cooperatingwith the rounded portion" 18 of thelower tension element to form afiaring entrance throat for the yarn. Pref erably the lower plate 1.6 ext s forwardly (Fig.3) a slight distance beyon' the forward i edge of theplate 21 to insure entrancejof the j At the forward edge of the form [of a"1ip',24 preferably bent more or yarn'between them.

flange 22 is preferably extended upwardly in less to acurvature substantially concentric with thelfrear edge of lower plate 16,fis disposed behind the downwardly curved portion 13 of the fixed arm 11. p This upper ten.-

a substantially flatpiece of hard the place of the parts 5 of Fig.2.

the plate 2 1 the sion element isalso furnished with a substantially straight rear edge en aging the .fiat rear wall 25 ofthe recess 1e and, like the plate 16 1s prevented from turningupon the post 15 as an axisby the-engagement OfltS rear edge with the wall 25. g A spring 26 en- CII'Cl QS thG screw 15, bearing at its lower end .against the tension. rnember 21 at its upper end against a shoulder on thescrew. The tension of the spring-may thus be adjusted by turning the-screw; preferably the-arm the crew? 15 to hold in adj usted 'positiamr 7 the arrangement shown inFig. 7 the block Twith itsarms 11" and 12*,the screw 4, 15 and-thee r1n l 26corres 0nd to similar parts shown in Fig. 3,.but1nthis device the lower removable wear-resistant member 16 above descrlbedl'isomltted and the arm-12 Jitself constitutesthe lower tension element,

withstand the cuttingaction ofthe thread without undul hardening other parts'ofthe block so that 1t maybenecessary to replace the entire block at" relatively frequent intervals,whereas inthe preferred form' of the 1-1 is split providing a narrow slit extending a nto the bore 1n vwhich the screw 15 s disposed andthe resil ency of the inetaltends to p nch.

device-it is merely necessary to exchange the removable tension element 16 for a new one. 'In F1gs.;.4and 8 I have shown the tension bloc-k7 associated'with an elongate member 28 providedat one end with upcurved fingers 29 and 30constituting a yarn delivery eye.

Theniember 28 is'provided at a suitable point with'an aperture for the' passa'ge of the boss B. The member28 withits thread eye is disposedina suitablech'annel at the bottom of the thread delivery passage and is held therein 'in operative 7 position by means of the t v I block 7- Which rests upon it, the delivery eye of the screw15 and being provided at its left- I side (as viewed in'Fig.4) with anup standing flange 22; which also extends around the front edge of the tension'element. 'This comprising the fingers 29 and 30 then taking As show'n in Fig. 1, I preferably provide ayarnguide pin 27 at such a point in the shuttle body .that the yarn .Y, extending through the arm delivery passage, moves in forwardly and then laterally through the threading slot (iand as it drops down into the yarn delivery passage it slips smoothly over the curvedouter face of the member 18, thence downover the exposed portion of the lip 24 and the curved surface 23 into the flaring throat between the tension plates, and as it is drawn into the thread delivery eye 5 it :a' substantially straight'line between the pin 27 and the'delivery eye 5, so that it follows "a rectilinear path in its passagebetween the tension elements. v

In threading the shuttle, the yarn is drawn,

j tension elements about-the fpin .1

1 entersbetwe'eriftlie raisiii'g'Tth plate against?thei tensi'on of thefsp o v giiice theplates'ar"spaeedapartby theboss s i i i plates; remain sub uniform "tensioni 1 10 I ujjpeifplate tends to s of plate 16 as ana .cess 1 L flatand to V The devicetl provided'is veryflsimple 1 H construetion easy "d "\Vhilel-ha ve hereln embodiment f of "the invention, itfiis'f to be understood that Yarious changes in shape'tproportion and 'rela ti've"arrangement of parts v si'or; 'elemenfitoward:

i b-lo'ck51t: 1 I w .'6'.;"Infoombination-:Withi a shuttle l ving f'a*' 1 19 a" dis-tanoe siibstantially feqlial"to -the' sfiac;

Eng produced TL opjer'ation,', thereb" iieingfl accurate and I ltshoiild befnote in [this connectloiifl when the yarn enter a between the plates;

win

than upon the forwardpart parallel disposition of the pl atesiesults in 20 a f more Uniformi ny desired 'ma nn-er.

zirovidedsuch as will prevent rotation I 1 dii s'clofsedj a designs" I claim: I j; i 1. Atensiondevice of the class-described,

0 about the rear edge h s,;the*lipi2 sliding 11p i behind the part 13; and except for the pro vi-sien of the lugs :19, the upper tens 'on' 'memher would tend toi'take'jan inclinedpositiom thus pressing morestrongl uponethef rear par'tof the yarn thereof. hgthe presentarrangementfthe secured in position in} j Likewise, while it is preferred to make ,thefrearwall of there give the tension elements r L correspondingstraight rear' edges, it ob-' Vious that other 'cooperatingasurfaces ay fie any; parallel during;

"ez'iterjiding forwardly from:'-the chamber and laterally to a i sh t1e;' b y l downwardly-into .1 away opening'laterally ii distribution of the p'ress ir'ef Said-block having:arecess openingiatkopp oj en the'yarn-andthnsfamorepertainvaction Y Obviously theispacen members 19 may be w'c-a rried by thenppej r tension element or may:

be separate members an ghaving smoothll *roimded' PQrtiQnsL-defining a flaring? throat ,d ra'w'n provides; very uniform tensionfij lt'does' not lower pafts thereofi'thenpper arm tennmatmg in a "downwardly c'urved gnard ain Pl te a *wiarfilyydil eted flangesbatim least one side 'edge,' thefront 'fiange'exte ding upidardly ]O6hind 'the 1; tap ering comprising a lowerltension element and, a;

' 'fi Xed arm spaced from andjoverhangingsaid 1 [1' toward and ifrom the loiver tension element a element, said arm terminatingcin a downwardly directed portion'itapering to a thin edge; and an upper tei'ision -element movable andhaving a; yarn guiding portionextending I upwardly and behind the tapering portion of said overhangingarm. j v 2. A tension'deyice of-the class described;

comprising a. lower tensionfelementg a fixed arm overhanglng the lower tension element,

the outer end of said arnilo eing directed down i (v ardlyand hair ings'moothly curvedinner and I outer surfaces merging infia thin' lower edge,

' andian upper tension element movabletoward andfrom the lower tension-element said iipper tension element having a lip-vprovided with a smooth outer surface normally conftlireadingi slot bi t spaeditherefrom p a" -r'eeess in the 'bl0ok,"11said :elementsfhaving 1 edges :exposed t'hro'u'gh ian opening} .in -tl1e v lolook', and irneans:ieiitending upwardly irony V thevl' ppertension element;andipr ovidingsa' 5 1 {surface} sii'bstantially continuous fiwith 3 the slot; saidfe qiofse having I ten si'onfmembers Carried by theblok an e arms [pro may o ning intq gaidslot, afblolck seated raceae eisitiba fopsn' i an r la ly mev bl lid'sedat 'saidnpeningyz l -iqmbi i ionwi h.a shu V s. ebbin- "chamloer; a thread: deliverygpas'sag d livery eye}; at the sidep ,thef

l'reading-t slottf extendin said delivery i as agefan a, t a d s f nd delivery passage; a block seated'in aiaea' iiy,

omprisingfaiblockfhavingahody'portion and I paring; to" a 'thin edge,z-af tension elementi'co n-g smoothly eiirved r front anat threading slot thereingan'dia, cavity oliening V L hethi'eadi g slot;:.a.tension :bl '01: seats I v dicayiitylsaidzblok hayingeismoothlyj rounded. ilk-face opposedftogthe ital-Lilo]? the? or relatively movable-teiision elements within 1 devised-or; sh ittlesCOm riSQIi :ingjupfp'er and loiyeritensioii elements; u -res1l 1fently: urgmgi (one :eleme'ht toward- .1 the 1 gtending downwardly, l tlie *iipp'ei" Zten'sion=-e1e'=; ;ment being ,gapableofswinging about. the:

rear portion of-the loweritensionielement as" 1 f 50 a i i 12. A tension device comprising a :block adapted to seat in a cavity in ashuttle body, I said block having a bore adjacent to one si forward; edge'an upwardly directed" lip curved on an arc substantially coneentric with the rearedge' of the lower element; the

innersurface of the downwardly extending pmofthe overhanging arm being curved to accommodate upwardswing of the lip of the uppertensionelement; I a

185A tensionlide'vice of the class described I comprising ablock adapted to be seated'in a 'huttlebody, said block having a recesstherein,'the'recess having'asubstantially flat-wall, a pair of; tension elements within the recess,

I each elementhaving a substantially straight edgeengagingfsaid fiat wall, each element mean part beingsplit to provide a narrow slot lead- 7 ing into said bore, a screw engagingsaid part and retained; in adj listed fposition therein by the resilient pinching action of the slo'tted part, a pair of relatively movable, tension elements, the spring also engaging said screw thereby tension.

I Signedby a at Lawr nce, Mass, this ea;

dayofoctober l928. I r i H R AL ON DAVOL.

having an opening therethrough, and a fixed I;

' post'extending through said openings, th'eenQ- "gag'en ent of the straight edges of saidele 7 ments with cthe wall of the recesspreventing y rotationlof the elements about the post.

' =9. A yarn tension devicefor shuttles com.- 1

prising ablock adapted to seat'i n acavity, in

a. shuttle body, tension elementscarried by f g i the block, the' block having a'downwardly projecting boss adapted to enter a socket ,in

the shuttle @body, an elongate memberghaving' a thread gni'deleye' at its'end; said elongate memberfhaving an opening for the reception ing upper-andlower tension plates,-;means-resiliently urging one :plate toward theother, 'said resilient means vacting at a point inter' mediate the edges of the plates, the yarn path ofsaid boss whereby the block with its boss holds. the elongate member withdts thread W in p a e, po i -ion in the sh-uttle bod i ;lO.fA-tension device for shuttles comprisingsuppe'r andflower tension plates,means resiliently urging one plate toward the other,

ing betweenthemto insure substantial parallelism of'theplates when in operation.

and spacer means between the plates at a i point remote from the path of the yarn passpermittingadjnstment of the spring elementsyand a spring engaging oneofsaid V 11. A tension device for shuttles compris- I l i being at one side of said resilient means, and

spacer means carried by one plate atthe oppowhereby to maintain the Site side of said resilientmea-ns fromthe am- 7 ath, said spacer meansholding the p ates v apart a distance substantially 'equalto the spacing produced by 'an interposed yarn relation during operation.

for: the receptionofan anchoring-bolt, the

7 block having arecess at one'side-of said bore, 1 relatively movable tension elements at the V lower part of said recess, a spring in the recess ."bearing against the upper tension element, a

' screw engaging a threaded bore in the'block,

said screw having a'shoulder engaging the spring whereby to adjust the tension of the the screw in adjusted position.v

13.A tension device comprising apart latter,*the'blockhaving means forretaining provided with a screwsthreaded bore, said 

